CN113418256A - Heat pump air conditioning system and working method thereof - Google Patents
Heat pump air conditioning system and working method thereof Download PDFInfo
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- CN113418256A CN113418256A CN202110801276.XA CN202110801276A CN113418256A CN 113418256 A CN113418256 A CN 113418256A CN 202110801276 A CN202110801276 A CN 202110801276A CN 113418256 A CN113418256 A CN 113418256A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
- F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/04—Preventing the formation of frost or condensate
Abstract
The invention discloses a heat pump air conditioning system and a working method thereof. The heat pump air conditioning system comprises a temperature adjusting module and a heat pump module, wherein the temperature adjusting module is arranged at an external heat exchanger of the heat pump module; the temperature adjusting module is used for executing heating operation when the heat pump module heats. The heating operation is executed through the temperature adjusting module, so that the air inlet temperature of the windward side of the external heat exchanger in a low-temperature environment can be obviously improved; the capacity of the external heat exchanger to evaporate the liquid refrigerant can be improved; meanwhile, the temperature of the external heat exchanger can be increased, the problem that the surface of the external heat exchanger is frosted or frozen due to low external environment temperature is avoided, the normal work of the external heat exchanger is ensured, and the working range of the conventional heat pump air-conditioning system is expanded.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a heat pump air conditioning system and a working method thereof.
Background
The heat pump air conditioning system is responsible for the heating and cooling requirements of new energy vehicle types, has low manufacturing cost and is relatively energy-saving. The temperature regulating system based on the heat pump technology comprises a compressor, a condenser, an expansion pot and an evaporator. The compressor outputs refrigerant of high-temperature and high-pressure gas to the condenser; the condenser releases heat outwards to convert high-temperature and high-pressure gas into low-temperature and high-pressure liquid; the low-temperature high-pressure liquid is conveyed to the evaporator through the expansion kettle; the evaporator absorbs external energy, evaporates and absorbs heat to realize a refrigeration function, and outputs the refrigerant to the compressor. The temperature regulation is achieved by circulation of a refrigerant.
A heat pump module used in an existing heat pump air conditioning system includes an external heat exchanger disposed outside a vehicle, a heat exchanger disposed inside the vehicle, a compressor, a valve, and the like. In the cooling process in summer, the circulation path of the refrigerant is controlled by a valve as follows: compressor-external heat exchanger-compressor; the external heat exchanger then performs the function of a condenser and the heat exchanger performs the function of an evaporator. When heating in winter, the control of the valve makes the circulation path of the refrigerant: compressor-heat exchanger-external heat exchanger-compressor; the heat exchanger now functions as a condenser and the external heat exchanger as an evaporator.
According to the prior technical scheme, the external heat exchanger is arranged outside the vehicle and is easily influenced by the temperature of the external environment, particularly, under a low-temperature environment, the evaporation capacity of a refrigerant in the external heat exchanger is limited, and even the problems of frosting and even icing of the external heat exchanger under the low-temperature environment exist, so that the heat pump module cannot be normally used, and the heating effect of a passenger compartment is further deteriorated.
In order to solve the problem of poor low-temperature heating effect of the heat pump module, the heating effect is improved by adding a heating device to a heat exchanger in the prior art. For example, patent application publication No. CN107020915A, is directed to heating gaseous refrigerant by other means, on the indoor side; so as to improve the heating effect in winter; however, this method is equivalent to that a set of heating device is added on the basis of the original heat pump system to realize heating, and the performance of the original heat pump system cannot be improved well, and the change is large and the method consumes more energy.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a heat pump air-conditioning system and a working method thereof, and solves the problems that the heat pump air-conditioning system cannot be started normally in a low-temperature environment, the working efficiency is low, and the energy consumption is high.
In order to achieve the above purpose, the invention provides the following technical scheme:
a heat pump air conditioning system comprises a temperature adjusting module and a heat pump module, wherein the temperature adjusting module is arranged at an external heat exchanger of the heat pump module; the temperature adjusting module is used for executing heating operation when the heat pump module heats.
Preferably, the temperature regulation module is disposed on the windward side surface of the exterior heat exchanger by bolting or gluing.
Preferably, the temperature adjusting module comprises a semiconductor heating and refrigerating sheet; the semiconductor heating and refrigerating piece is used for executing cooling operation when the heat pump module refrigerates.
Preferably, the temperature adjusting module further comprises a controller, and the controller is used for controlling the starting of the semiconductor heating and cooling piece, the current direction and the current magnitude after the starting according to the working state of the heat pump module and the external temperature.
Preferably, the heat pump module includes an exterior heat exchanger, a compressor, a first cut-off valve, a second cut-off valve, a third cut-off valve, and a fourth cut-off valve; the output end of the compressor is connected with the input end of the compressor through a first stop valve, an external heat exchanger, a heat exchanger and a second stop valve; one end of the third stop valve is connected with the output end of the compressor, and the other end of the third stop valve is connected with one end of the heat exchanger, which is far away from the compressor; one end of the fourth stop valve is connected with the input end of the compressor, and the other end of the fourth stop valve is connected with one end of the external heat exchanger close to the compressor.
Preferably, the heat pump module further comprises a cooling fan and a blower; the cooling fan is provided at the external heat exchanger, and the blower fan is provided at the heat exchanger.
A working method of a heat pump air conditioning system comprises the following steps:
during heating:
collecting the temperature of the refrigerant at the inlet of the external heat exchanger, the pressure of the refrigerant at the inlet of the external heat exchanger and the temperature of the refrigerant at the outlet of the external heat exchanger; and obtaining a superheat degree of the exterior heat exchanger based on a refrigerant temperature of an inlet of the exterior heat exchanger, a refrigerant pressure of the inlet of the exterior heat exchanger, and a refrigerant temperature of an outlet of the exterior heat exchanger;
judging whether the superheat degree is in a preset range, and if the superheat degree is smaller than the minimum value of the preset range, increasing the heating power of the temperature adjusting module; if the superheat degree is within the preset range, keeping the heating power of the temperature adjusting module unchanged; if the superheat degree is larger than the maximum value of the preset range, reducing the heating power of the temperature adjusting module;
and repeating the steps to maintain the superheat degree of the external heat exchanger within a preset range.
Preferably, the method for operating a heat pump air conditioning system further includes the steps of:
during refrigeration:
collecting the temperature of the refrigerant at the inlet of the external heat exchanger, the pressure of the refrigerant at the inlet of the external heat exchanger and the temperature of the refrigerant at the outlet of the external heat exchanger; and obtaining a supercooling degree of the exterior heat exchanger according to a refrigerant temperature of an inlet of the exterior heat exchanger, a refrigerant pressure of the inlet of the exterior heat exchanger and a refrigerant temperature of an outlet of the exterior heat exchanger;
judging whether the supercooling degree is in a preset range, and if the supercooling degree is smaller than the minimum value of the preset range, increasing the refrigerating power of the temperature adjusting module; if the supercooling degree is within the preset range, keeping the refrigerating power of the temperature adjusting module unchanged; if the supercooling degree is larger than the maximum value of the preset range, reducing the refrigerating power of the temperature adjusting module;
and repeating the steps to maintain the supercooling degree of the external heat exchanger within a preset range.
Preferably, the heating also comprises self-heating operation, and the temperature adjusting module is started at a preset heating power when the heat pump module cannot be started due to low ambient temperature.
Compared with the prior art, the invention has the beneficial effects that: the temperature of the external heat exchanger can be improved by executing the heating operation through the temperature adjusting module, the problem that the external heat exchanger can not normally work due to frosting or icing on the surface caused by low external environment temperature is avoided, namely the normal work of the external heat exchanger at low temperature is ensured through the temperature adjusting module, and the working temperature range of the existing heat pump air-conditioning system is expanded; in addition, when the heat pump module heats, the temperature adjusting module performs heating operation, so that the air inlet temperature of the windward side of the external heat exchanger can be obviously improved, the external heat exchanger is helped to perform evaporation operation better, and the capacity of the external heat exchanger for evaporating liquid refrigerant can be improved. The scheme can improve the heating effect with lower energy consumption, and the energy consumption is lower than that of the prior regulating scheme for achieving the same regulating effect.
Description of the drawings:
fig. 1 is a system block diagram of a heat pump air conditioning system according to exemplary embodiment 1 of the present invention;
fig. 2 is a diagram of a refrigerant circulation path when the heat pump air conditioning system of exemplary embodiment 1 of the present invention heats;
fig. 3 is a diagram of a refrigerant circulation path in cooling of the heat pump air conditioning system according to exemplary embodiment 1 of the present invention;
fig. 4 is a schematic structural view of a heat pump air conditioning system according to exemplary embodiment 1 of the present invention;
fig. 5 is a diagram showing the experimental effect of the aperture of the heat pump air conditioning system according to exemplary embodiment 1 of the present invention;
fig. 6 is a schematic view of a network structure of a temperature regulation module of a heat pump air conditioning system according to exemplary embodiment 1 of the present invention;
fig. 7 is a schematic view of a hole structure of a temperature regulation module of a heat pump air conditioning system according to exemplary embodiment 1 of the present invention.
The labels in the figure are: 1-semiconductor refrigeration heater, 2-bolt, 3-external heat exchanger, 4-glue.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a heat pump air conditioning system, which includes a temperature adjustment module and a heat pump module, wherein the temperature adjustment module is disposed at an external heat exchanger of the heat pump module; the temperature adjusting module is used for executing heating operation when the heat pump module heats.
As shown in fig. 2, when the heat pump module heats in winter, the external heat exchanger as an evaporator needs to absorb external energy to evaporate the refrigerant. In the embodiment, the heating operation is performed through the temperature adjusting module, so that the air inlet temperature of the windward side of the external heat exchanger in the low-temperature environment can be obviously improved; the capacity of the external heat exchanger to evaporate the liquid refrigerant can be improved; meanwhile, the temperature of the external heat exchanger can be increased, the external heat exchanger is prevented from frosting or icing on the surface due to low external environment temperature, the normal work of the external heat exchanger is ensured, the working range of the conventional heat pump air-conditioning system is expanded, and the refrigerant is still evaporated normally in a low-temperature environment. In addition, the scheme of the embodiment has the advantages of simple structure, convenience in installation and low cost, and the improvement is carried out at the external heat exchanger, the existing heat pump module is not greatly changed, the heat pump air-conditioning system of the produced vehicle can be conveniently and quickly improved, and the heating effect is improved. The temperature adjusting module can be designed by adopting an electric heating element or a semiconductor heating and refrigerating sheet.
Illustratively, the temperature regulation module is disposed on the windward side surface of the exterior heat exchanger by bolting or gluing. As shown in fig. 4(a), the temperature regulation module 1 is fixedly provided on the windward side surface of the exterior heat exchanger 3 by a bolt 2; as shown in fig. 4(b), the temperature regulation module 1 is fixedly provided on the windward side surface of the exterior heat exchanger 3 by a glue 4.
The temperature adjusting module comprises a semiconductor heating and refrigerating piece and is also used for executing cooling operation when the heat pump module is used for refrigerating. As shown in fig. 3, when the heat pump module performs cooling in summer, the external heat exchanger serves as a condenser to release heat to the outside, and high-temperature and high-pressure gas is converted into low-temperature and high-pressure liquid. The cooling operation is carried out through temperature regulation module to this embodiment, can reduce external heat exchanger inlet air temperature in summer to external heat exchanger is external heat release better, increases external heat exchanger and as the super-cooled rate of condenser, improves air conditioning system refrigerating capacity, reduces compressor load and consumption, and external heat exchanger consumption is lower, consequently can wholly reduce the consumption, improves the continuation of the journey mileage of new forms of energy car.
The semiconductor heating and refrigerating sheet (TE) is also called as a thermoelectric refrigerating sheet, has high reliability and no refrigerant pollution, and adopts a direct current power supply mode. The semiconductor refrigerating sheet can refrigerate and heat, and the refrigeration or heating is switched by changing the polarity of direct current. The semiconductor refrigerating sheet consists of two ceramic sheets, wherein N-type and P-type semiconductor materials are arranged between the two ceramic sheets, when one N-type semiconductor material and one P-type semiconductor material are connected into a galvanic couple and are connected with direct current, energy transfer can be generated, and the current flows to a joint of the P-type semiconductor material from the N-type semiconductor material to absorb heat to form a cold end; the heat is released from the P-type semiconductor material to the junction of the N-type semiconductor material, becoming the hot end. The heat absorption and release of the semiconductor refrigerating plate are determined by the current and the logarithm of the semiconductor material elements of the N type and the P type. The power supply mode of the semiconductor refrigeration heater in this embodiment is that a low-voltage power supply supplies power.
The temperature adjusting module further comprises a controller, and the controller is used for controlling the starting of the semiconductor refrigerating sheet, the current direction and the current magnitude after the starting according to the working state of the heat pump module and the external temperature. The controller can be an independent control chip or an existing control system of the automobile.
The temperature adjusting module of the embodiment adjusts and controls the temperature of the inlet air at the windward side of the external heat exchanger. When heating in winter, the natural wind with lower temperature is heated, the capability of the external heat exchanger for evaporating the liquid refrigerant is improved, the external heat exchanger is prevented from frosting or freezing on the surface due to lower external environment temperature, the normal work of the external heat exchanger is ensured, and the working range of the conventional heat pump air-conditioning system is expanded. When refrigerating in summer, the air inlet temperature of the external heat exchanger is reduced, and the supercooling degree of the external heat exchanger as a condenser is increased.
When heating in winter, the external heat exchanger is used as an evaporator to absorb external energy so as to evaporate the refrigerant. The degree of superheat of the exterior heat exchanger may reflect the operating efficiency of the exterior heat exchanger at that time, and needs to be maintained within a predetermined range. The temperature of the refrigerant at the outlet of the external heat exchanger can reflect the superheat degree of the refrigerant, and the control logic of the temperature adjusting module for heating the natural wind with lower temperature is as follows: and detecting the temperature of the refrigerant at the inlet of the external heat exchanger and the temperature of the environment at the outlet of the external heat exchanger, and controlling the heating power of the temperature adjusting module to maintain the superheat degree of the external heat exchanger within a preset range. The regulation strategy in summer refrigeration is similar to that in winter heating, the temperature of the refrigerant at the inlet of the external heat exchanger and the temperature of the refrigerant at the outlet of the external heat exchanger and the ambient temperature are detected, and the supercooling degree of the external heat exchanger is maintained within a preset range by controlling the refrigeration power of the temperature regulation module.
The heat pump module comprises an external heat exchanger, a compressor, a first stop valve, a second stop valve, a third stop valve and a fourth stop valve; the output end of the compressor is connected with the input end of the compressor through a first stop valve, an external heat exchanger, a heat exchanger and a second stop valve; one end of the third stop valve is connected with the output end of the compressor, and the other end of the third stop valve is connected with one end of the heat exchanger, which is far away from the compressor; one end of the fourth stop valve is connected with the input end of the compressor, and the other end of the fourth stop valve is connected with one end of the external heat exchanger close to the compressor. In summer refrigeration, the first stop valve and the second stop valve are opened, and the third stop valve and the fourth stop valve are closed; the circulation path of the heat pump air conditioning system refrigerant is shown in fig. 3. In winter, when heating, the third stop valve and the fourth stop valve are opened, and the first stop valve and the second stop valve are closed; the circulation path of the heat pump air conditioning system refrigerant is shown in fig. 2. The switching between the refrigeration circuit and the heating circuit is realized by the matching use of the first stop valve, the second stop valve, the third stop valve and the fourth stop valve.
The heat pump module also comprises a cooling fan and a blower; the cooling fan is provided at the external heat exchanger, and the blower fan is provided at the heat exchanger. The cooling fan and the blower fan are used for improving the energy exchange efficiency of the external heat exchanger and the heat exchanger.
Wherein, the temperature adjusting module is in a net shape or a hole shape.
As shown in fig. 6, when the temperature adjusting modules are in a mesh shape, the heating wires of the temperature adjusting modules are distributed in a grid shape, and the electrode plates of the heating wires are distributed on both sides. As shown in fig. 7, when the temperature control module is in the form of a hole, the temperature control module is provided on the windward side of the exterior heat exchanger as a porous membrane.
The wind side resistance of the temperature adjusting module of the porous membrane or the reticular heating wire cannot be larger than 10% of the resistance of the condenser body, otherwise, the wind side resistance of the front end module is obviously increased, and the windward area of the condenser is affected. The temperature regulation module design must take into account wind resistance.
Taking a porous temperature adjusting module as an example, as shown in fig. 5, through CFD simulation calculation, as the aperture and the number of holes increase, the wind resistance of the heating film decreases, but the effective heating area also decreases, so in practical application, it is necessary to increase the heat area and decrease the wind resistance; according to the actual processing and manufacturing process, the heating film with the aperture of 6mm has a good application effect.
The temperature adjusting module of the embodiment adjusts and controls the temperature of the inlet air at the windward side of the external heat exchanger. When heating in winter, the natural wind with lower temperature is heated, the capability of the external heat exchanger for evaporating the liquid refrigerant is improved, the external heat exchanger is prevented from frosting or freezing on the surface due to lower external environment temperature, the normal work of the external heat exchanger is ensured, and the working range of the conventional heat pump air-conditioning system is expanded. When refrigerating in summer, the air inlet temperature of the external heat exchanger is reduced, and the supercooling degree of the external heat exchanger as a condenser is increased. Meanwhile, through the reasonable design of the shape and the installation mode of the external heat exchanger, the influence of the assistance of the external heat exchanger and the temperature regulation effect are considered, so that the temperature regulation of the automobile is better.
Example 2
The embodiment provides a working method of a heat pump air conditioning system, which comprises the following steps:
during heating:
collecting the temperature of the refrigerant at the inlet of the external heat exchanger, the pressure of the refrigerant at the inlet of the external heat exchanger and the temperature of the refrigerant at the outlet of the external heat exchanger; and obtaining a superheat degree of the exterior heat exchanger based on a refrigerant temperature of an inlet of the exterior heat exchanger, a refrigerant pressure of the inlet of the exterior heat exchanger, and a refrigerant temperature of an outlet of the exterior heat exchanger;
judging whether the superheat degree is in a preset range, and if the superheat degree is smaller than the minimum value of the preset range, increasing the heating power of the temperature adjusting module; if the superheat degree is within the preset range, keeping the heating power of the temperature adjusting module unchanged; if the superheat degree is larger than the maximum value of the preset range, reducing the heating power of the temperature adjusting module;
and repeating the steps to maintain the superheat degree of the external heat exchanger within a preset range.
The working method of the heat pump air conditioning system further comprises the following steps:
during refrigeration:
collecting the temperature of the refrigerant at the inlet of the external heat exchanger, the pressure of the refrigerant at the inlet of the external heat exchanger and the temperature of the refrigerant at the outlet of the external heat exchanger; and obtaining a supercooling degree of the exterior heat exchanger according to a refrigerant temperature of an inlet of the exterior heat exchanger, a refrigerant pressure of the inlet of the exterior heat exchanger and a refrigerant temperature of an outlet of the exterior heat exchanger;
judging whether the supercooling degree is in a preset range, and if the supercooling degree is smaller than the minimum value of the preset range, increasing the refrigerating power of the temperature adjusting module; if the supercooling degree is within the preset range, keeping the refrigerating power of the temperature adjusting module unchanged; if the supercooling degree is larger than the maximum value of the preset range, reducing the refrigerating power of the temperature adjusting module;
and repeating the steps to maintain the supercooling degree of the external heat exchanger within a preset range.
When the superheat degree or the supercooling degree of the external heat exchanger of the temperature adjusting module does not reach a preset range, the superheat degree or the supercooling degree of the external heat exchanger is increased by adjusting the ambient temperature; the superheat degree or the supercooling degree of the external heat exchanger is maintained within a preset range by adjusting the heating power or the cooling power of the temperature adjusting module, so that the external heat exchanger works in the optimal working state.
In the heating mode, the self-heating operation is also included, and the temperature adjusting module is started at a preset heating power when the heat pump module cannot be started due to low ambient temperature. The normal work of the external heat exchanger is ensured by avoiding the frosting or icing on the surface of the external heat exchanger due to the lower temperature of the external environment, and the working range of the existing heat pump air-conditioning system is expanded.
The foregoing is merely a detailed description of specific embodiments of the invention and is not intended to limit the invention. Various alterations, modifications and improvements will occur to those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. A heat pump air conditioning system is characterized by comprising a temperature adjusting module and a heat pump module, wherein the temperature adjusting module is arranged at an external heat exchanger of the heat pump module; the temperature adjusting module is used for executing heating operation when the heat pump module heats.
2. The heat pump air conditioning system of claim 1, wherein the temperature regulation module is disposed on a windward side surface of the exterior heat exchanger by bolting or gluing.
3. The heat pump air conditioning system of claim 1, wherein the temperature regulation module comprises a semiconductor heating and cooling sheet; the semiconductor heating and refrigerating piece is used for executing cooling operation when the heat pump module refrigerates.
4. The heat pump air conditioning system of claim 3, wherein the temperature adjustment module further comprises a controller, and the controller is configured to control the starting of the semiconductor heating/cooling fins, and the current direction and current magnitude after the starting according to the working state of the heat pump module and the external temperature.
5. The heat pump air conditioning system of claim 1, wherein the heat pump module includes an exterior heat exchanger, a compressor, a first shutoff valve, a second shutoff valve, a third shutoff valve, and a fourth shutoff valve; the output end of the compressor is connected with the input end of the compressor through a first stop valve, an external heat exchanger, a heat exchanger and a second stop valve; one end of the third stop valve is connected with the output end of the compressor, and the other end of the third stop valve is connected with one end of the heat exchanger, which is far away from the compressor; one end of the fourth stop valve is connected with the input end of the compressor, and the other end of the fourth stop valve is connected with one end of the external heat exchanger close to the compressor.
6. The heat pump air conditioning system of claim 5, wherein the heat pump module further comprises a cooling fan and a blower; the cooling fan is provided at the external heat exchanger, and the blower fan is provided at the heat exchanger.
7. The working method of the heat pump air conditioning system is characterized by comprising the following steps:
during heating:
collecting the temperature of the refrigerant at the inlet of the external heat exchanger, the pressure of the refrigerant at the inlet of the external heat exchanger and the temperature of the refrigerant at the outlet of the external heat exchanger; and obtaining a superheat degree of the exterior heat exchanger based on a refrigerant temperature of an inlet of the exterior heat exchanger, a refrigerant pressure of the inlet of the exterior heat exchanger, and a refrigerant temperature of an outlet of the exterior heat exchanger;
judging whether the superheat degree is in a preset range, and if the superheat degree is smaller than the minimum value of the preset range, increasing the heating power of the temperature adjusting module; if the superheat degree is within the preset range, keeping the heating power of the temperature adjusting module unchanged; if the superheat degree is larger than the maximum value of the preset range, reducing the heating power of the temperature adjusting module;
and repeating the steps to maintain the superheat degree of the external heat exchanger within a preset range.
8. The method of operating a heat pump air conditioning system as claimed in claim 7, further comprising the steps of:
during refrigeration:
collecting the temperature of the refrigerant at the inlet of the external heat exchanger, the pressure of the refrigerant at the inlet of the external heat exchanger and the temperature of the refrigerant at the outlet of the external heat exchanger; and obtaining a supercooling degree of the exterior heat exchanger according to a refrigerant temperature of an inlet of the exterior heat exchanger, a refrigerant pressure of the inlet of the exterior heat exchanger and a refrigerant temperature of an outlet of the exterior heat exchanger;
judging whether the supercooling degree is in a preset range, and if the supercooling degree is smaller than the minimum value of the preset range, increasing the refrigerating power of the temperature adjusting module; if the supercooling degree is within the preset range, keeping the refrigerating power of the temperature adjusting module unchanged; if the supercooling degree is larger than the maximum value of the preset range, reducing the refrigerating power of the temperature adjusting module;
and repeating the steps to maintain the supercooling degree of the external heat exchanger within a preset range.
9. The method of claim 7, wherein the heating operation further comprises a self-heating operation, and the temperature adjustment module is activated with a predetermined heating power when the heat pump module cannot be activated due to a low ambient temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023048210A1 (en) * | 2021-09-22 | 2023-03-30 | 伸和コントロールズ株式会社 | Film affixing/cutting device, film separation device, and laminating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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